drupalcampbristol/core/modules/outside_in/templates/outside-in-page-wrapper.html.twig

{#
/**
 * @file
 * Default theme implementation for a page wrapper.
 *
 * For consistent wrapping to {{ page }} render in all themes.
 *
 * Available variables:
 * - children: Contains the child elements of the page.
 *
 * @ingroup themeable
 */
#}
{% if children %}
  <div id="main-canvas-wrapper">
    <div id="main-canvas">
      {{ children }}
    </div>
  </div>
  <div class="offcanvas-lining"></div>
{% endif %}